120 HELIX. 



The above is a rare species, more nearly allied than the others to 

 the European H. arbustorum. Dr. J. G. Cooper, and following him 

 Mr. W. G. Binney refer to Californiensis as varieties, H. NicUin- 

 iana, H. ramentosa, H. reticulata. H. Diabloensis, etc., all of which 

 appear to me to belong to an entirely different group, and I have so 

 treated them (see pp. 73, 74.). H. vincta, Val. (figured but not de- 

 scribed) is a synonym. 



Section IV, EURYSTOMA, Albers, 1850. 



H. VITTATA, Miiller. PL 33, figs. 59, 60, 62. 



Perforate, striated, shining, whitish, variously banded with brown 

 and yellow, apex black ; whorls 5, somewhat planulate, the last with 

 convex base, descending in front ; aperture dark brown, peristome 

 labiate, expanded, margins joining by a callus, columellar dilated, 

 partly covering the umbilicus. Diam. 28 mill. 



Ceylon, Malabar, CoromandeL 



H. zonula, Wood (fig. 62) is a synonym. 



Var. SPINOL^, Villa. PI. 33, fig. 61. 



Smaller, white, unicolored, apex bluish brown. Diam. 22 mill. 



CONTINUATION OF TRYON'S MONOGRAPH OF THE 

 HELICID.E, BY H. A. PILSBRY. 



Group X, PENTAT^NIA, A. Schmidt. 



Shell globose or somewhat depressed, of moderate or large size, 

 imperforate or moderately umbilicate, usually with five revolving 

 bands ; animal provided with a dart ; jaw moderately arched, and, 

 except in Allognathus, w r ith strong separated ribs, usually few in 

 number, and grouped on its median portion ; the central teeth have 

 a strong middle cusp ; the side cusps are usually obsolete ; the lat- 

 erals are similar, but asymmetrical ; the marginal teeth have several 

 short cusps. 



I follow Kobelt in grouping the following subgenera under the 

 general head of Pentatsenia. The number of bands in nearly every 

 species of the group is normally five, but frequently is less, through 

 coalescence or absence of bands. This pentatseniate character will 

 separate the group from the preceding, Arionta, which has one or 

 three bands, and from Rhayada Xeropliila, etc., which have numerous 

 bands. The group is European in distribution, and comprises the 

 largest and most characteristic helices of that region. 



